Needleless luer access connector

ABSTRACT

A needleless luer access connector is disclosed having a septum disposed in a housing. The septum has a proximal portion with a cross section, a medial portion with a cross section smaller than the cross section of the proximal portion, and a distal portion. A longitudinal slit extends through the septum from the proximal portion to the distal portion. The septum and housing are designed so that septum will not be rotated or removed from the housing when the connector is accessed by a male luer taper. In addition, the septum and housing are designed to bias the slit at the distal portion closed and so a male luer connector does not have to extend completely through the distal portion to open the slit at the distal portion. Finally, the septum and housing are designed to minimize the amount of dead space in the connector when accessed with a male luer taper.

[0001] This application is a continuation of application Ser. No.10/017,024 filed Dec. 7, 2001.

BACKGROUND OF THE INVENTION

[0002] The subject invention relates to a needleless connector referredto generally as a luer access device that allows a clinician to access afluid flow line without the use of sharp needles. More particularly, thesubject invention relates to a needleless luer access connector that maybe opened by a standard male luer taper of a medical device, such as asyringe. The penetration of the connector by the male luer taper allowsfluid flow through the connector. When the male luer taper is removedfrom the connector, it closes to prevent fluid flow therethrough.

[0003] In the treatment of patients, fluids are transferred betweenvarious containers and intravascular (IV) lines or through IV cathetersinto the patient through a closed system to prevent microbial ingress tothe patient. During the course of such treatment where an IV catheterhas been placed into a patient to gain access to the patient'svasculature, it may be necessary to infuse other fluids, such asmedicaments, through the catheter into the patient or to withdraw bloodfrom the patient for blood gas or other analysis. Such fluid withdrawalor injection into a patient may be through IV lines, saline wells,arterial lines, or hemodialysis lines. Previously, a rubber or siliconeseptum was used to cover an opening in the catheter or the IV line toprevent fluid from flowing out of the opening and to maintain a closedsystem. A clinician could access the opening by inserting a sharp needlefrom a syringe through the septum. This allowed the clinician to infusefluid from the syringe into the patient or withdraw fluid from thepatient into the syringe. The septum would reseal after the needle waswithdrawn to prevent back flow of the fluid.

[0004] In recent years, there has been great concern over thecontamination of clinicians with a patient's blood or other fluid and arecognition that such “blood contaminated sharps” must be immediatelydisposed. This concern has arisen because of the advent of currentlyincurable and fatal diseases, such as Acquired Immune DeficiencySyndrome (“AIDS”) and hepatitis, which can be transmitted by theexchange of body fluids from an infected person to another person. Thus,contact with the body fluid of an AIDS or hepatitis infected person mustbe avoided to prevent the transmission of such diseases to a healthyperson. If a needle has been used to access an IV line in communicationwith an AIDS or hepatitis infected person, the needle is a vehicle forthe transmission of the disease. Although clinicians are aware of theneed to properly handle “blood contaminated sharps”, unfortunately incertain medical environments, such as emergency situations or as aresult of inattention or neglect, needlesticks with contaminated needlesstill occur. As a result of the problem of accidental needlesticks by“blood contaminated sharps”, much effort has been expended in developingvarious connectors that avoid the use of sharp needles.

[0005] One type of needleless connector includes a longitudinallymovable diaphragm that controls the flow of fluid through an internalcannula fixed in the connector. This internal cannula defines the fluidflow path through the connector. The movable diaphragm cooperates with abiasing member such as a spring or other flexible member that biases thetop of the movable diaphragm toward the inlet or proximal opening to theconnector. The opening is typically in the form of a female luerconnection. When the movable diaphragm is adjacent to the inlet of theconnector, the movable diaphragm occludes the opening to the internalcannula to close the connector to fluid flow. The connector can beopened when the clinician inserts the male luer taper of another medicaldevice, such as a syringe, into the female luer portion of theconnector. When this is done, the movable diaphragm is pushed down intothe housing so the internal cannula extends through a pre-formed slit inthe movable diaphragm providing a fluid flow path through the connector.

[0006] Although such connectors can generally operate in accordance withtheir intended function, such connectors could be improved. When the tipof the internal cannula engages the movable diaphragm, the internalcannula has a tendency to core the movable diaphragm. This may causepieces of the movable diaphragm to be broken off and potentially infusedinto a patient. In addition, this coring of the movable diaphragmpromotes fluid leakage of the connector and can result in a pathway formicrobial ingress. Finally, the force needed to move the movablediaphragm pas the tip of the internal cannula could be quite high makingit difficult to operate and resulting in a substantial kickback forcethat tends to push the male luer taper back out of the connector.

[0007] A potential improvement to connectors with internal cannula areconnectors that include a longitudinally movable diaphragm having amolded in opening through the diaphragm to control the flow of fluidthrough the connector. Some biasing member biases the movable diaphragmtoward the inlet of the device. In this position, the proximal portionof the movable diaphragm is radially biased by the sidewalls of thehousing defining the inlet opening of the connector to bias closed themolded in opening. This prevents fluid flow through the connector. Whenthe clinician inserts the male luer taper of the syringe into the inletof the connector, the movable diaphragm is moved down into the connectorto an area that does not contact the proximal portion of the movablediaphragm. This allows the proximal portion of the diaphragm to returnto its unbiased condition with the molded in opening in the openposition to provide a fluid flow through the connector. Thus, theseconnectors do not need an internal cannula to extend through thediaphragm to provide the fluid flow path through the connector.

[0008] However, connectors having a molded in opening are not withoutproblems. For example, the molded in opening in the movable diaphragmmay not be tightly closed when in the inlet. This could result inleakage through the connector and provide a path for microbial ingress.In addition, the high activation force and kick back problems are notresolved because of the biasing mechanism that is still used in thesetypes of connectors.

[0009] Yet another approach has been the development of a connector thatcan be accessed by a blunt cannula that is connected to the standardmale luer taper of a standard syringe. Such a connector has a septumhaving a longitudinal slit extending through it disposed over an openingon a proximal end of the connector. The distal end of the connectorincludes a standard male luer taper so the connector can be connected toother medical devices and IV lines having a female luer connection. Thistype of connector cannot be accessed with a standard male luer taperbecause a standard male luer taper is too large to fit into the space inthe opening not already occupied by the septum. Instead this type ofconnector is accessed by a blunt cannula that is narrower than astandard male luer taper and which can be attached to a standard maleluer taper. When the clinician desires to access the medical device orIV line, a blunt cannula is placed on the syringe and is then insertedthrough the slit in the septum. This places the syringe in fluidcommunication with the medical device or IV line. After fluid isinjected into or withdrawn from the patient, the syringe with the bluntcannula is removed from the septum. Because of the design of theconnector, the slit in the septum closes and prevents the backflow offluid through the device.

[0010] Although slit septum connectors that can be accessed by a bluntcannula work generally in accordance with their intended purpose theycould be improved. For example, this type of connector requires that aseparate blunt cannula be connected to the male luer taper of anothermedical device to allow the connector to be accessed. This requiresexcess inventory problems and adds costs to the health care facilityusing the connector. Moreover, the blunt cannula typically does not fillup the space in the housing of the connector when it is accessed. Thisleaves an annular “dead space” cavity in the housing between the sidesof the blunt cannula and the inner walls of the housing. Residual bloodmay be left in this cavity and provide a breeding ground for variousgerms and microbes and is difficult to flush.

SUMMARY OF THE INVENTION

[0011] It is therefore an object of this invention to provide aconnector that can be accessed without the use of a needle.

[0012] It is another object of this invention to provide a needlelessluer access connector that is not prone to leakage or microbial ingress.

[0013] It is yet another object of this invention to provide aneedleless luer access connector that minimizes the dead space volumetherein.

[0014] It is still another object of this invention to provide aneedleless luer access connector that does not require a high degree offorce to access and minimizes the kickback force when the connector isaccessed.

[0015] It is a further object of this invention to provide a needlelessluer access connector that does not require any additional or specialdevices to access.

[0016] The needleless luer access connector of this invention includes ahousing having a top portion and bottom portion with an inlet at the topof the top portion of the connector and an outlet at the bottom of thebottom portion of the connector. The inlet and top portion are designedand configured so that the needleless luer access connector of thisinvention can be connected to a standard male luer taper configurationof another medical device. Similarly, the outlet and bottom portion hasa standard male luer configuration that can be connected to a standardfemale luer configuration of another medical device. A septum is locatedin the top portion of the connector to control fluid flow through theconnector. The septum has an enlarged proximal portion, a narrowedelongated medial portion and an enlarged distal portion. Theconfiguration of the narrowed elongated medial portion allows theneedleless luer access connector of this invention to be accessed with astandard male luer taper. It is also designed to minimize both accessand kickback force. A longitudinal slit is formed in the septum andextends through the proximal, medial and distal portions thereof. Thetransverse axis of the slit is preferably parallel to the major axis ofthe medial portion. The proximal portion of the septum projects abovethe top of the inlet and rests on the top surface of the sidewalls ofthe housing located at the periphery of the inlet. Preferably the topsurface has two diametrically opposed high portions and twodiametrically opposed low points to give the proximal portion of theseptum a saddle like configuration. This saddle like configurationbiases the slit closed along the proximal portion of the septum. This isone mechanism to ensure a tight seal to prevent leakage and microbialingress. The distal portion of the septum is captured between theproximal portion and the distal portion of the housing.

[0017] When a male luer taper is pushed against the proximal surface ofthe septum, it deflects distally and laterally and allows the male luertaper to access the slit in the septum. In addition, the distal andlateral deflection of the septum forces the slit to open and allows themale luer taper to penetrate the septum through the slit. When the maleluer taper is fully inserted into the septum, the slit is forced openalong the entire length of the septum so that the septum allows fluid toflow through the connector. The needleless luer access connector of thisinvention is configured so that the male luer taper does not have toextend completely through the septum to completely open the slit at thedistal portion of the septum. This is achieved by ensuring that thecircumference of the distal portion of the septum is held in place bythe housing and by increasing the mass along the distal portion of theseptum. The increased mass at the distal portion of the septum isachieved by providing the distal portion of the septum with a radialdimension that is larger than the radial dimension of the medial portionof the slit. As a result of holding the circumference of the distalportion of the septum in place and the increased mass of the distalportion of the septum, the septum acts as a swinging door to fully openthe slit when the male luer taper is inserted fully into the septum. Themale luer taper can thereafter be removed from the septum allowing theseptum to return to its prestressed state and close the connector tofluid flow.

[0018] The external surface of the medial portion of the septum may beformed with ribs that engage complementary ribs formed on the internalsurface of the sidewalls of the housing. When the male luer taper isfully inserted into the septum the external surface of the medialportion of the septum engages the internal surface of the sidewalls ofthe housing. The ribs are located on the septum and the housing in theappropriate location so that when the septum is accessed by the maleluer taper, the ribs on the septum engage the ribs on the housing. Theinterengagement of the ribs causes the septum to remain temporarilylocked in place with respect to the housing. Once the male luer taperhas been removed sufficiently from the septum so that the externalsurface of the medial portion of the septum no longer engages theinternal surface of the sidewalls of the housing the ribs disengage toallow the septum to return to its prestressed state. This featureprevents the septum from being pulled out of the housing when the maleluer taper is removed from the connector. Various configurations for theribs could be used to achieve this effect. For example, complementaryribs and detents or grooves or slots could be formed on the externalsurface of the medial portion of the housing and the internal surface ofthe sidewalls of the housing. Alternatively, these features could beformed along the proximal portion of the connector instead of along themedial portion of the connector.

[0019] A variation of the foregoing feature is the use of various keyand keyhole configurations formed on the septum and the housing toprevent rotation of the septum during male luer access and removal. Forexample, the proximal portion of the septum could be formed with a keythat fits into a keyhole formed along the proximal portion of thehousing. The keys and keyholes could have various complementary shapes.The only limitation is that the keys and keyholes hold the septumagainst rotational movement with respect to the housing.

[0020] Another mechanism to facilitate the closing of the connectoragainst fluid flow is to have the septum and housing configured so thatthe septum is compressed along the sides of the slit at least at thedistal portion of the septum. Alternatively or concurrently, the septumand housing can be configured so that the septum is pulled in tension atthe ends of the slit. This configuration provides a tight seal toprevent leakage and microbial ingress. In order to achieve this forcedistribution, the distal portion of the septum could be formed with asubstantially circular cross section while the housing adjacent to thedistal portion of the septum when the septum is in its prestressedcondition could be formed with a substantially elliptical or oval crosssection. If the slit is located so that it is aligned with the majoraxis of the ellipse, i.e., the transverse axis of the slit and the majoraxis of the ellipse are collinear or parallel, the slit will be biasedto a closed position. The minor axis of the ellipse will tend tocompress the sides of the slit together while the major axis of theellipse will tend to place the ends of the slit in tension thus forcingthe slit closed. This effect can also be achieved by formingcomplementary tabs and slots in the septum and housing that pull andpush the septum in the appropriate directions. In addition, this effectcan be achieved by forming the distal portion of the septum with asubstantially elliptical or oval cross section and the relevant portionof the housing could be formed with a substantially circular crosssection. With this configuration, the transverse axis of the slit shouldbe collinear or parallel to the minor axis of the slit. This circle willtend to pull the minor axis apart and push the major axis together toclose the slit.

[0021] The housing minimizes the amount of dead space by carefullymatching the configuration of the distal portion of the septum when amale luer taper fully accesses the connector with the location andconfiguration of the sidewalls in the housing that form the fluid flowpath through the connector. In other words, when a male luer taper isinserted into the needleless luer access connector of this invention,the distal portion of the septum is forced distally into the housing andoccupies at least a portion of the space in the distal portion of thehousing. The sidewalls in the connector are configured so they engagethe distal portion of the septum that is displaced distally by the maleluer taper. In this way, the sidewalls in conjunction with the distalportion of the septum minimizes dead space in the housing.

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The preferred embodiments are illustrated in the drawings inwhich like reference numerals refer to like elements and in which:

[0023]FIG. 1 is an exploded perspective view of the needleless lueraccess connector of this invention;

[0024]FIG. 1A is a perspective view of the top portion of the housingfor the needleless luer access connector of this invention showing linesin phantom to help explain the shape of the top surface of the topportion;

[0025]FIG. 2 is a cross-sectional view of the needleless luer accessconnector of this invention closed to fluid flow and with a male luertaper of another medical device such as a syringe poised for penetrationof the connector;

[0026]FIG. 3 is a cross-sectional view of the needleless luer accessconnector of this invention with a male luer taper of another medicaldevice such as a syringe disposed in the connector so that it is open tofluid flow;

[0027]FIG. 4 is a perspective view of the needleless luer accessconnector of this invention;

[0028]FIG. 5 is a top plan view of the needleless luer access connectorof this invention shown in FIG. 4;

[0029]FIG. 6 is a perspective view of a first embodiment of the septumused in the needleless luer access connector of this invention;

[0030]FIG. 7 is a perspective view in cross-section of the firstembodiment of the septum used in the needleless luer access connector ofthis invention;

[0031]FIG. 8 is a side elevational view of the first embodiment of theseptum used in the needleless luer access connector of this inventionshowing the major length of the medial portion of the septum;

[0032]FIG. 9 is an exploded perspective view in cross section of theneedleless luer access connector of this invention with a secondembodiment of the septum and the housing;

[0033]FIG. 10 is a cross sectional view of the needleless luer accessconnector of this invention with the second embodiment of the septum andthe housing with a male luer taper of another medical device such as asyringe poised for penetration of the connector;

[0034]FIG. 11 is a cross sectional view of the needleless luer accessconnector of this invention with the second embodiment of the septum andthe housing and a male luer taper disposed therein;

[0035]FIG. 12 is a cross sectional view of the needleless luer accessconnector of this invention with a third embodiment of the housing and amale luer taper of another medical device such as a syringe poised forpenetration of the connector;

[0036]FIG. 13 is a cross sectional view of the needleless luer accessconnector of this invention with the third embodiment of the housing anda male luer taper of another medical device such as a syringe disposedin the connector so that it is open to fluid flow;

[0037]FIG. 14 is an exploded perspective view in cross section of theneedleless luer access connector of this invention with a thirdembodiment of the septum and a fourth embodiment of the housing;

[0038]FIG. 15 is a cross sectional view of the needleless luer accessconnector of this invention with the third embodiment of the septum andthe fourth embodiment of the housing with a male luer taper of anothermedical device such as a syringe poised for penetration of theconnector;

[0039]FIG. 16 is a cross sectional view of the needleless luer accessconnector of this invention with the third embodiment of the septum andthe fourth embodiment of the housing with a male luer taper disposedtherein;

[0040]FIG. 17 is an exploded perspective view of a portion of theneedleless luer access connector of this invention showing a fourthembodiment of the septum and a fifth embodiment of the housing;

[0041]FIG. 18 is a side elevational view of the needleless luer accessconnector of this invention showing the fourth embodiment of the septumand the fifth embodiment of the housing;

[0042]FIG. 19 is an exploded perspective view of a portion of theneedleless luer access connector of this invention showing a fifthembodiment of the septum and a sixth embodiment of the housing;

[0043]FIG. 20 is a side elevational view of the needleless luer accessconnector of this invention showing the fifth embodiment of the septumand the sixth embodiment of the housing;

[0044]FIG. 21 is an exploded perspective view of a portion of theneedleless luer access connector of this invention showing a sixthembodiment of the septum and the seventh embodiment of the housing;

[0045]FIG. 22 is a side elevational view of the needleless luer accessconnector of this invention showing the sixth embodiment of the septumand the seventh embodiment of the housing;

[0046]FIG. 23 is an exploded perspective view of a portion of theneedleless luer access connector of this invention showing a seventhembodiment of the septum and an eighth embodiment of the housing;

[0047]FIG. 24 is a side elevational view of the needleless luer accessconnector of this invention showing the seventh embodiment of the septumand the eighth embodiment of the housing;

[0048]FIG. 25 is an exploded perspective view of a portion of theneedleless luer access connector of this invention showing and eighthembodiment of the septum and a ninth embodiment of the housing;

[0049]FIG. 26 is a side elevational view of the needleless luer accessconnector of this invention showing the eighth embodiment of the septumand the ninth embodiment of the housing;

[0050]FIG. 27 is an exploded perspective view of a portion of theneedleless luer access connector of this invention showing a ninthembodiment of the septum and a tenth embodiment of the housing;

[0051]FIG. 28 is a side elevational view of the needleless luer accessconnector of this invention showing the ninth embodiment of the septumand the tenth embodiment of the housing;

[0052]FIG. 29 is a top plan view in cross section of the needleless lueraccess connector of this invention taken along line 29-29 of FIG. 4showing an eleventh embodiment of the housing;

[0053]FIG. 30 is a top plan view of the eleventh embodiment of housingwith the septum removed from the housing;

[0054]FIG. 31 is a top plan view in cross section of the needleless lueraccess connector of this invention similar to the view of FIG. 29 butshowing a twelfth embodiment of the housing;

[0055]FIG. 32 is a top plan view of the twelfth embodiment of thehousing with the septum removed from the housing;

[0056]FIG. 33 is an exploded perspective view of a portion of theneedleless luer access connector of this invention showing a tenthembodiment of the septum and a thirteenth embodiment of the housing;

[0057]FIG. 34 is an exploded cross sectional view of a portion of theneedleless luer access connector of this invention showing the tenthembodiment of the septum and the thirteenth embodiment of the housing;

[0058]FIG. 35 is a top plan view of the thirteenth embodiment of thehousing of the needleless luer access connector of this invention;

[0059]FIG. 36 is a top plan view of the tenth embodiment of the septumof the needleless luer access connector of this invention;

[0060]FIG. 37 is a bottom plan view of the distal portion of the septumhaving an elliptical cross section and showing in phantom that portionof the housing engaging the distal portion of the septum with a circularcross section to provide a comparison between the two;

[0061]FIG. 38 is a bottom plan view of the distal portion of the septumhaving a circular cross section and showing in phantom that portion ofthe housing engaging the distal portion of the septum with an ellipticalcross section to provide a comparison between the two;

[0062]FIG. 39 is a bottom plan view of the distal portion of the septumhaving an elliptical cross section;

[0063]FIG. 40 is a bottom plan view of the distal portion of the septumhaving an elliptical cross section with a slit having a molded openconfiguration;

[0064]FIG. 41 is a bottom plan view of the distal portion of the septumhaving a circular cross section;

[0065]FIG. 42 is a bottom plan view of the distal portion of the septumhaving a circular cross section with a slit having a molded openconfiguration;

[0066]FIG. 43 is a bottom perspective view partially in cross section ofthe needleless luer access connector of this invention showing thedistal portion of the septum and that portion of the housing thatengages the distal portion of the septum;

[0067]FIG. 44 is a bottom perspective view partially in cross section ofthe needleless luer access connector of this invention showing thedistal portion of the septum and that portion of the housing thatengages the distal portion of the septum rotated 90 degrees from theview of FIG. 43;

[0068]FIG. 45 is a cross sectional view of the needleless luer accessconnector of this invention closed to fluid flow and a male luer taperof another medical device such as a syringe poised for penetration ofthe connector;

[0069]FIG. 46 is a cross sectional view of the needleless luer accessconnector of this invention with a male luer taper of another medicaldevice such as a syringe disposed in the septum in the connector butwith the connector still closed to fluid flow;

[0070]FIG. 47 is a cross sectional view of the needleless luer accessconnector of this invention with a male luer taper of another medicaldevice such as a syringe disposed further in the connector but with thedistal end of the male luer taper proximal of the distal end of theseptum but with the connector open to fluid flow; and

[0071]FIG. 48 is a cross sectional view of the needleless luer accessconnector of this invention with a male luer taper of another medicaldevice such as a syringe disposed as far as it can go in the connectorbut with the distal end of the male luer taper proximal of the distalend of the septum and with the connector open to fluid flow.

DETAILED DESCRIPTION OF THE INVENTION

[0072] As used herein, the term “proximal”, “top”, or “upwardly” refersto a location on the device that is closest to the clinician using thedevice and farthest from the patient in connection with whom the deviceis used when the device is used in its normal operation. Conversely, theterm “distal”, “bottom”, “down” or “downwardly” refers to a location onthe device that is farthest from the clinician using the device andclosest to the patient in connection with whom the device is used whenthe device is used in its normal operation.

[0073] As used herein, the term “in” or “inwardly” refers to a locationwith respect to the device that, during normal use, is toward the insideof the device. Conversely, as used herein, the term “out” or “outwardly”refers to a location with respect to the device that, during normal use,is toward the outside of the device.

[0074] The needleless luer access connector of this invention includes ahousing 10 having a top portion 12 and bottom portion 16. Typicallyplastic materials such as polycarbonate, or PETG could be used to formhousing 10. Housing 10 defines an inlet 11 and an outlet 17 with acavity or bore 13 extending therebetween. Inlet 11 is defined at the topof top portion 12 and outlet 17 is defined at the bottom of bottomportion 16 of the needleless luer access connector. Inlet 11, and thusthat portion of bore 13 adjacent to inlet 11 and that portion of topportion 12 adjacent to inlet 11, must be sized and configured inconformity with at least some of the International StandardsOrganization (ISO) standards for a female luer connection. This willallow a male luer slip or lock to be connected to inlet 11. Thus, inlet11 has a maximum external diameter of about 0.265 inches (6.73millimeters) and an internal diameter of about 0.214 inches (5.44millimeters) to allow a male luer taper to extend into inlet 11. Theexterior of the top of top portion 12 includes luer threads 14 thatallow another medical device having a male luer lock to be connected tothe top of proximal portion 12. Alternatively, no luer threads 14 needbe formed on the exterior of the top of top portion 12 so that anothermedical device having a male luer slip can be connected to the top oftop portion 12. Outlet 17, and thus that portion of bore 13 adjacent tooutlet 17 is sized and configured as a male luer taper that complieswith the ISO standards for a male luer taper. ISO standard 594-2:1998(E)requires that the male luer taper have a minimum length of about 0.2953inches (7.5 millimeters). Forming this part of housing 10 in accordancewith ISO standards allows the needleless luer access connector of thisinvention to be connected to a standard female luer configuration ofanother medical device. If desired, a luer lock collar 16 a may beformed about the male luer taper to lock the connector to a female luer.In such a case, the luer lock should comply with ISO standards.According to ISO standards, the root diameter R of the thread on themale luer lock fitting should be about 0.315 inches (8 millimeters) andthe crest diameter C of the thread on the male luer lock fitting shouldbe about 0.276 inches (7 millimeters). In addition, the male luer tapermust extend a minimum of about 0.083 inches (2.1 millimeters) past theend of luer lock collar 16 a.

[0075] As seen especially in FIG. 1, the top surface 15 of top portion12 adjacent to inlet 11 transitions between two high points A and twolow points B. Each high point A is about 180 degrees apart from eachother and each low point B is also about 180 degrees apart from eachother such that each high point A is about 90 degrees from each lowpoint B. Preferably, each high point A should be greater than zero butless than about 0.050 inches (1.143 millimeters) higher than each lowpoint B. Most preferably, each high point A should be about 0.027 inches(0.686 millimeters) higher than each low point B. To achieve a smoothcircumferential top surface 15 that transitions in a smooth undulatingfashion between high points A and low points B, top surface 15 can beformed by using a curved surface with a radius of about 0.30 inches(7.62 millimeters) as the template to cut the top of proximal portion12. In geometric terms, the imaginary cylinder C1 defined by the top ofproximal portion 12 can be cut with an imaginary cylinder C2 having aradius of about 0.30 inches (7.62 millimeters) oriented 90 degrees tothe longitudinal axis of the imaginary cylinder C1 defined by the top ofproximal portion 12. This results in top surface 15 having the shapedescribed. By changing the radius of the imaginary cylinder C1, thedistance between high points A and low points B can be changed. See FIG.1A.

[0076] A septum 20 is located in top portion 12 of the needleless lueraccess connector to control fluid flow therethrough. Typically materialssuch as silicone or polyisoprene could be used for form septum 20.Septum 20 has an enlarged proximal portion 21, a medial portion 22 andan enlarged distal portion 23. The top of enlarged proximal portion 21can be formed with an annular lip 24 extending about the circumferenceof proximal portion 21. Lip 24 provides extra mass to give enlargedproximal portion 21 extra rigidity to prevent it from folding in when itis accessed by a male luer taper. Medial portion 22 has a crosssectional area that is smaller than the cross sectional area of proximalportion 21 and smaller than the cross sectional area of distal portion23. Preferably medial portion 22 has a generally oblong cross-sectionwith a major axis M1 substantially equal to the internal diameter ofinlet 11. Alternatively, the major axis may be slightly greater than theinternal diameter of inlet 11 to help ensure that septum 20 remains ininlet 11. The minor axis M2 of medial portion 22 is smaller than thediameter of proximal portion 21 and smaller than the internal diameterof inlet 11. Thus, medial portion 22 has a cross-sectional area that issmaller than the cross-sectional area of inlet 11. This provides a spacebetween the external surfaces of medial portion 22 along the major axisthereof and the sidewalls of housing 10 that define inlet 11 where thematerial of septum 20 can be displaced when a male luer taper isdisposed in septum 20. As seen in FIG. 7, enlarged distal portion 23defines an annular slot 26 extending about the bottom thereof. Inaddition, an enlarged diametrical portion 27 extends across the bottomof enlarged distal portion 23.

[0077] A slit 25 if formed in septum 20 and extends longitudinallythrough proximal portion 21, medial portion 22 and distal portion 23. Asseen in the top plan view of septum 20 of FIG. 5, slit 25 has atransverse axis T and is defined by a pair of sides 25 a and a pair ofends 25 b. Preferably, diametrical portion 27 of enlarged distal portion23 extends from sides 25 a of slit 25 along an apex 28 back to thebottom surface of enlarged distal portion 23. Diametrical portion 27provides increased mass adjacent to the bottom of slit 25 to help keepslit 25 closed against fluid flow.

[0078] Septum 20 is disposed in top portion 12 of housing 10 such thatenlarged proximal portion 21 rests on top of top surface 15. As aresult, enlarged proximal portion 21 projects above the top of inlet 11.In addition, because of the undulating configuration of top surface 15,proximal portion 21 is pushed upon along high points A. Septum 20 isaligned in housing 10 such that the middle of sides 25 a of slit 25 arealigned with each of the high points A and transverse axis T is alignedwith low points B. Thus the minor axis of medial portion 22 is alignedwith high points A and the major axis of medial portion 22 is alignedwith low points B. distal portion 23 is captured between top portion 12and bottom portion 16 of housing 10 such that preferably the top wall ofbottom portion 16 engages annular slot 26 of septum 20. The bottom wallof top portion 12 is bonded to a circumferential flange 19 formed alonga medial portion of bottom portion 23 adjacent to luer lock collar 16 a.If desired, an annular slot 19 a can be formed in flange 19 and thebottom wall of top portion 12 can be inserted into annular slot 19 a.Any standard bonding technique, such as chemical adhesive or ultrasonicwelding can be used to bond top portion 12 to bottom portion 16.Preferably, medial portion 22 is held in tension when septum 20 islocated in housing 10. This tension in combination with portions ofproximal portion 21 being lifted up by high points A on top surface 15results in a compressive force being exerted against sides 25 a to forceslit 25 closed at least at the top of proximal portion 21.

[0079] When a male luer taper of another medical device, such as asyringe, is pushed against the top of proximal portion 21 of septum 20,proximal portion 21 deflects distally and laterally and allows the maleluer taper to access slit 25 in septum 20. As the male luer taper ispushed further into slit 25, medial portion 22 also deflects distallyand laterally. Compare FIGS. 2 and 3. By having a cross-section formedial portion 22 that is smaller than the cross-section of bore 13,space is provided inside bore 13 to allow such lateral deflection ofmedial portion 22. This distal and lateral deflection of septum 20forces slit 25 to open and allows the male luer taper to penetrateseptum 20 into slit 25. When the male luer taper is fully inserted intoseptum 20, slit 25 is forced open along the entire length of septum 20and thus allows fluid to flow through septum 20 and the needleless lueraccess connector of this invention. Thereafter, the male luer taper ofthe other medical device can be withdrawn from slit 25. The inherentresiliency of septum 20 causes septum 20 to return to its normalunstressed state with slit 25 closed. This prevents any further fluidflow through septum 20.

[0080] Because septum 20 may be formed from materials such as siliconeor polyisoprene, it is possible for septum 20 to stick to the male luertaper and be withdrawn from housing 10 as the male luer taper iswithdrawn from housing 10. In order to avoid this potential problem, topportion 12 of housing 10 and septum 20 may be formed with complementarycatch features that hold proximal portion 21 of septum 20 in place. Forexample, a groove 50 extending at least partially about thecircumference of the internal surface of top portion 12 could be formedadjacent to top surface 15. In such an embodiment, two grooves 50 couldbe located about 180 degrees apart on the internal surface of topportion 12 aligned with high points A. Alternatively, groove 50 couldextend about the entire circumference of the internal surface of topportion 12. See FIGS. 9 through 11. A rib 51 could be formed along aportion of medial portion 22 and adapted to fit in groove 50. Preferablytwo ribs 51 are used and are located on either side of medial portion 22about 180 degrees apart a long the major axis of medial portion 22.Groove 50 would be located on either side of top portion 12 to engageribs 51. Thus, when a male luer taper enters slit 25, medial portion 22is displaced such that ribs 51 fit into grooves 50 to hold septum 20 inhousing 10 until the male luer taper has been removed from septum 20.This interengagement between grooves 50 and ribs 51 avoids the potentialproblem of septum 20 sticking to the male luer taper and being withdrawnfrom housing 10 as the male luer taper is withdrawn from housing 10.Since grooves 50 and ribs 51 engage with one another when septum 20 isdisplaced laterally and distally by the male luer taper, the male luertaper can be removed from septum 20 without pulling septum 20 out ofhousing 10. The longitudinal location of grooves 50 and ribs 51 can bedetermined by simple routine experimentation to see where a portion ofseptum 20 engages the internal sidewall of proximal portion 12. Theinherent resiliency of septum 20 allows grooves 50 and ribs 51 todisengage from each other once the male luer taper has been removed fromseptum 20 and thus allows septum 10 to return to its unbiased, i.e.,unstressed state.

[0081] A variation of this configuration is shown in FIGS. 12 and 13where at least one rib 61 is formed in top portion 12 adjacent to inlet11 and extending into inlet 11. Preferably two ribs 61 are used and arelocated about 180 degrees apart so they are adjacent to high points A.Alternatively, one rib could be used that would extend about the entirecircumference of the internal surface of top portion 12. Ribs 61 thusface the major axis of medial portion 22 so that when septum 20 isdisplaced laterally and distally when a male luer taper enters slit 25,ribs 61 engage septum 20 and hold septum 20 in housing 10. Because ofits inherent resiliency, septum 20 can conform to the shape of ribs 61and thus engage with and be held by ribs 61 until the male luer taper isremoved from septum 20.

[0082] The external surface of medial portion 22 of septum 20 may beformed with ribs 31 about 180 degrees apart along the major axis. Inaddition, complementary barbs 32 may be formed on the internal sidewallsof proximal portion 12 of housing 10 adjacent to inlet 11 and alignedwith high points A. See FIGS. 14 through 16. Ribs 31 and barbs 32 areformed so as to engage with one another when brought into contact witheach other. Thus, when the male luer taper of another medical device isfully inserted into septum 20, the external surface of medial portion 22of septum 20 is forced distally and laterally so that it engages theinternal sidewalls of proximal portion 12 of housing 10. Ribs 31 arelocated on septum 20 and barbs 32 are located on the internal sidewallsof top portion 12 of housing 10 so that when septum 20 is fully accessedby the male luer taper, ribs 31 engage barbs 32. Preferably, two ribs 31are formed on septum 20 about 180 degrees apart along either side ofmedial portion 22 along the major axis thereof. Preferably two barbs 32are located on the internal sidewalls of top portion 12 about 180degrees apart and aligned with high points A so they are adjacent toribs 31 when a male luer taper is inserted into septum 20. Thelongitudinal location of ribs 31 and barbs 32 can be determined bysimple routine experimentation to see where a portion of septum 20engages the internal sidewall of proximal portion 12. Theinterengagement of ribs 31 and barbs 32 helps to maintain septum 20 inplace with respect to housing 10 as the male luer taper is beingwithdrawn from slit 25. This interengagement avoids the potentialproblem of septum 20 sticking to the male luer taper and being withdrawnfrom housing 10 as the male luer taper is withdrawn from housing 10.Since ribs 31 and barbs 32 interfere with and engage one another, themale luer taper can be removed from septum 20 without pulling septum 20out of housing 10. However, the inherent resiliency of septum 20 allowsribs 31 and barbs 32 to disengage from each other once the male luertaper has been removed from septum 20 and thus allows septum 10 toreturn to its unbiased state.

[0083] Various configurations for ribs 31 and barbs 32 could be used toachieve this effect. For example, complementary ribs and detents orgrooves could be formed on the external surface of medial portion 22 ofseptum 20 and the internal sidewalls of top portion 12. Barbs 32 can beformed anywhere along the axial length of top portion 12 but preferablybarbs 32 are located close to top surface 15 and adjacent to inlet 112.This leaves a smaller portion of septum 20 above barbs 32 that may bepulled out of top portion 12 when the male luer taper is removedtherefrom. If barbs 32 are located too far distally from top surface 15,a significant portion of septum 20 may be stretched and pulled out oftop portion 12 if that portion of septum 20 sticks to the male luertaper.

[0084] A variation of the foregoing feature is the use of various keyand keyhole configurations formed on septum 20 and top portion 12 toprevent rotation of septum 20 during insertion of a male luer taper intoseptum 20 or removal of a male luer taper from septum 20. See FIGS. 17through 28. This may be necessary, especially where inlet 11 isconfigured for a male luer lock. In such a case the male luer taper ofanother medical device is typically rotated with respect to housing 10of the needleless luer access connector of this invention to insert themale luer taper into the connector and lock it in place and to unlockthe male luer taper and remove it from the connector. For example, a key40 could be formed on septum 20 adjacent to enlarged proximal portion 21of septum 20 along the minor axis of medial portion 22 and aligned with,i.e., collinear or parallel, transverse axis T of slit 25 and the majoraxis of medial portion 22. Key 40 could merely be an extension from oneside of septum 20 and can be formed in any shape. For example, a simplerectangular shape, see FIGS. 17 and 18, could be used as well as atriangular, see FIGS. 19 through 22, or other polygonal shape, see FIGS.23 and 24, could be used. Preferably, two keys 40 are used and arelocated about 180 degrees apart and aligned with transverse axis T andthe major axis of medial portion 22. A complementary slot or keyhole 41could be formed along adjacent to top surface 15 at top portion 12 ofhousing 10. Preferably, two keyholes 41 are used and are located about180 degrees apart aligned with the low points B. Keys 40 need not extendto the periphery of enlarged proximal portion 21 and keyholes 41 neednot extend completely through the sidewall of top portion 12. Instead,keys 40 could be formed as a rib extending from medial portion 22 andkeyholes 41 could be formed as complementary grooves formed in theinternal sidewall of top portion 12. The only limitation is that keys 40and keyholes 41 must be configured and located with respect to eachother so that they combine to hold septum 20 against rotational movementwith respect to housing 10. Moreover, keys 40 a could be formed alongtop surface 15 of top portion 12 of housing 10 and keyholes 41 a can beformed in septum 20 adjacent to proximal portion 21. See FIGS. 25through 28. Preferably two keys 40 a and two keyholes 41 a are used withkeys 40 a a bout 180 degrees apart and keyholes 41 a about 180 degreesapart. Keys 40 a or keyholes 41 a can be located anywhere about thecircumference of proximal portion 21. However, preferably keys 40 a arealigned with low points B and keyholes 41 a are aligned with the majoraxis of medial portion 22 and transverse axis T of slit 25. Although theembodiments of FIGS. 17 through 28 preferably have a top surface 15 withhigh points A and low points B, the keys and keyholes of theseembodiments could be used where the needleless luer access connector ofthis invention has a flat top surface 15 with no high or low points.

[0085] Bore 13 could be formed with a longitudinally extending groove 71that engages the ends of medial portion 22. See FIGS. 29 and 30.Preferably, two grooves 71 are used and each groove 71 is preferablyabout 180 degrees apart and substantially aligned with the low points B.In this manner each end of medial portion 22 parallel to the minor axisengages grooves 71 to hold septum 20 against rotation with respect tobore 13. Alternatively, bore 13 could be formed with two shoulders 72therein that engage the ends of medial portion 22. See FIGS. 31 and 32.Again, preferably two shoulders 72 are used and each shoulder 72 ispreferably about 180 degrees apart and substantially aligned with thelow points B. These configurations for bore 13 help to hold medialportion 22, and thus septum 20, in place against rotation with respectto housing 10 where a male luer taper is inserted or removed from septum20 by twisting the male luer taper.

[0086] Since proximal portion 21 of septum 20 merely rests on topsurface 15 of top portion 12 of housing 10, it is possible that proximalportion 21 could be forced into bore 13 of top portion 12 when a maleluer taper is pressed against the top of proximal portion 21. Aconfiguration for septum 20 and housing 10 that helps to hold proximalportion 21 in place when a male luer taper is forced into slit 25 isshown in FIGS. 33 through 36. In this embodiment, risers 81 are formedin top portion 12 adjacent to and extend up from top surface 15 and areabout 180 degrees apart. Risers 81 include outwardly extending flanges82 thereon. Slotted portions 83 are formed along the periphery ofproximal portion 21 and allow flanges 82 to extend into and throughslotted portions 83. Preferably two slotted portions 83 about 180degrees apart are formed on proximal portion 21 and extend generallyparallel to transverse axis T of slit 25 on either side thereof. Ifdesired, a barb can be formed on risers 81 or flange 82 to engageslotted portions 83 and help hold slotted portions 83 in place withrespect to top surface 15. This engagement also helps to hold proximalportion 21 in place when a male luer taper is forced into slit 25.Preferably, top surface 15 is flat in this embodiment. However, ifdesired, top surface 15 may be formed with an undulating curved surfacewith two high points and two low points as in the other embodiments. Ifsuch an undulating surface were used, risers 81 would include the highpoints.

[0087] In order to facilitate the closing of slit 25 against fluid flow,the portion of housing 10 that engages distal portion 23 of septum 20can be configured so that housing 10 compresses distal portion 23 ofseptum 20 along the sides of slit 25. Alternatively or concurrently, theportion of housing 10 that engages distal portion 23 of septum 20 can beconfigured so housing 10 pulls distal portion 23 of septum 20 in tensionat the ends of slit 25, i.e., along transverse axis T. One way toachieve this force distribution is for distal portion 23 of septum 20 tobe formed with a substantially circular cross section while the portion12 of housing 10 that engages distal portion 23 is formed with asubstantially elliptical or oval cross section. See FIG. 38. By locatingslit 25 so that transverse axis T is parallel to the major axis of theellipse, slit 25 will be biased to a closed position. This is becausethe minor axis of the ellipse will tend to compress sides 25 a of slit25 together while the major axis of the ellipse will tend to pull ends25 b of slit 25 in tension thus forcing slit 25 closed. As noted above,either tension along slit 25 or compression perpendicular to slit 25 canbe applied and not necessarily both. Only tension can be achieved byforming the minor axis of the ellipse so that it is substantially equalto the diameter of the circular cross section of distal portion 23 andforming the major axis of the ellipse so that it is greater than thediameter. Only compression can be achieved by forming the minor axis ofthe ellipse so that it is smaller than the diameter and forming themajor axis of the ellipse so that it is substantially equal to thediameter. This effect can also be achieved by forming complementary tabsand slots in distal portion 23 of septum 20 and the portion of housing10 that engages distal portion 23 to pull and push distal portion 23 inthe appropriate directions as described above.

[0088] Alternatively and preferably, distal portion 23 of septum 20 isformed in an elliptical configuration and the portion of housing 10 thatengages distal portion 23 is formed with a circular cross section. SeeFIG. 37. When distal portion 23 has an elliptical configurationtransverse axis T of slit 25 is preferably aligned with, i.e.,collinear, with the minor axis of the ellipse. This configuration fordistal portion 23 and that portion of housing 10 that engages distalportion 23 facilitates manufacturing of the needleless access connectorof this invention because it does not require special alignment betweendistal portion 23 and housing 10. Only tension can be achieved byforming the minor axis of the ellipse so that it is less than thediameter of the circular cross section of distal portion 23 and formingthe major axis of the ellipse so that it is substantially equal to thediameter. Only compression can be achieved by forming the minor axis ofthe ellipse so that it is substantially equal to the diameter andforming the major axis of the ellipse so that it is greater than thediameter. Preferably, with this configuration, the minor axis of distalportion 23 is about 0.360 inches (9.144 millimeters) and the major axisof distal portion 23 is about 0.430 inches (10.922 millimeters) whendistal portion 23 is in its unstressed state. If desired, slit 25 can beformed so it is open when distal portion 23 is in its unstressed state.In this situation, slit 25 has an elliptical cross section at distalportion 23 with a minor axis of about 0.030 inches (0.762 millimeters)and a major axis of about 0.175 inches (4.445 millimeters) and distalportion 23 has a minor axis of about 0.360 inches (9.144 millimeters)and a major axis of about 0.460 inches (11.684 millimeters). See FIG.40. Of course, septum 20 can be formed with a circular cross section atdistal portion 23 and an open slit 25. See FIG. 42. Alternatively,septum 20 can be formed with an elliptical cross section at distalportion 23 with a closed slit 25, see FIG. 39, or a circular crosssection at distal portion and a closed slit 25, see FIG. 41.

[0089] When a male luer taper is pushed against the top proximal surfaceof septum 20, proximal portion 21 deflects distally and laterally andallows the male luer taper to access slit 25 in septum 20. As the maleluer taper is pushed further into slit 25, medial portion 22 alsodeflects distally and laterally. By having a cross-section for medialportion 22 that is smaller than the cross-section of bore 13, space isprovided in housing 10 to allow such lateral deflection of medialportion 22. This distal and lateral deflection of septum 20 forces slit25 to open and allows the male luer taper to penetrate septum 20 throughslit 25. When the male luer tape is fully inserted into septum 20, slit25 is forced open along the entire length of septum 20

[0090] Because of certain ISO standards, it is important that slit 25 isopen along the entire length of septum 20 even if the male luer taperdoes not extend completely through septum 20. For male luer locks, ISOstandard 594-2:1998(E) requires that the male luer taper have a minimumlength of about 0.295 inches (7.5 millimeters) and extend a minimum of0.083 inches (2.1 millimeters) past the end of the luer lock collar.Many manufacturers make their products with this minimum dimension. Inthe needleless access connector of this invention, the distance Xbetween the top of the medial sidewall of proximal portion 12 and thebottom of septum 20 is about 0.110 inches (2.794 millimeters). Thus itcan be seen that where a male luer taper having the minimum ISOdimensions is used to access the needleless access connector of thisinvention, the male luer taper will not extend completely through septum20. Because of these dimensions, septum 20 must be designed so that slit25 is forced open even if the male luer taper does not extend completelythrough septum 20. When a male luer taper is inserted into septum 20 adistance of about 0.214 inches (5.436 millimeters) from the top ofseptum 20, the bottom of slit 25 beings to open. When the male luertaper is inserted as far as it can extend into the needleless accessconnector, distal portion 23 can only be deflected distally down intobore 13 below where the bottom of distal portion 23 extends when it isnot accessed by a male luer taper. This distal deflection causes distalportion 23 to act as a swinging door and fully open slit 25. There isonly distal deflection of distal portion 23 because the circumference ofdistal portion 23 is held in place between proximal portion 12 anddistal portion 16 of housing 10 and there is no room for distal portion23 to move except distally. In addition, distal portion 23 has anincreased mass by virtue of its thickness, which is about 0.050 inches(1.27 millimeters) and which tapers up to about 0.080 inches (2.032millimeters) immediately adjacent to slit 25. This combination ofholding distal portion 23 against lateral movement and the increasedmass of distal portion forces slit 25 open and allows fluid to flowthrough the needleless luer access connector even if the male luer taperdoes not completely penetrate septum 20.

[0091] Housing 10 is designed to minimize the amount of any dead spacetherein where fluid could flow and be trapped. Any such trapped fluidcan provide a breeding ground for microbes and other organisms thatcould travel through the needleless luer access connector and into thepatient to infect the patient. Preferably, walls 60 are formed in distalportion 16 of housing 10 to fill any dead space therein. Walls 60 havean upwardly facing surface 61 that matches the configuration of distalportion 23 of septum 20 when a male luer taper fully accesses theneedleless luer access connector of this invention. See FIG. 48. In thisway, walls 60 do not interfere with the normal operation of theinvention while still filling any unused space within housing 10.

[0092] Thus, it is seen that a needleless access connector is providedthat can be accessed with the use of a needle, that is not prone toleakage or microbial ingress, that minimizes the dead space volumetherein, that does not require a high degree of force to access andminimizes the kickback force when the connector is accessed and thatdoes not require any additional or special devices to access.

We claim:
 1. A needleless luer access connector, comprising: a housing having a top portion defining an inlet opening, a channel defined by at least one sidewall extending from the inlet opening and having a cross section, and a bottom portion defining an outlet opening extending from the channel; a groove formed in the sidewall of the channel and extending into the channel; a septum disposed in the housing, the septum having a proximal portion, a medial portion having an external surface and a cross section less than a cross section of the top portion and less than the cross section of the channel and a distal portion; a longitudinal slit extending through the septum from the proximal portion through medial portion and into the distal portion; and at least one rib formed on the external surface of the medial portion such that the rib is disposed in the groove when a male luer taper is inserted into the slit.
 2. The needleless luer access connector of claim 1 wherein the longitudinal slit is defined by a pair of transversely extending walls of the septum and the external surface of the medial portion includes at least one portion that is substantially aligned with at least one of the transversely extending walls of the septum and the at least one rib is located on the at least one portion.
 3. The needleless luer access connector of claim 2 wherein the external surface of the medial portion includes two portions, each of which is substantially parallel to the pair of transversely extending walls of the septum.
 4. The needleless luer access connector of claim 3 including two ribs wherein one rib is located on each of the two portions of the external surface of the medial portion.
 5. The needleless luer access connector of claim 4 further including two grooves on the sidewall of the channel.
 6. The needleless luer access connector of claim 5 wherein the two grooves are about 180 degrees apart.
 7. The needleless luer access connector of claim 6 wherein the two grooves are aligned with the two ribs when a male luer taper is inserted into the slit.
 8. A needleless luer access connector, comprising: a housing having a top portion defining an inlet opening, a channel defined by at least one sidewall extending from the inlet opening and having a cross section, and a bottom portion defining an outlet opening extending from the channel; a rib formed along the sidewall of the channel and extending into the channel; a septum disposed in the housing, the septum having a proximal portion, a medial portion having an external surface and a cross section less than a cross section of the top portion and less than the cross section of the channel and a distal portion; and a longitudinal slit extending through the septum from the proximal portion through the medial portion and into the distal portion wherein the septum engages the rib when a male luer taper is inserted into the slit.
 9. The needleless luer access connector of claim 8 wherein the longitudinal slit is defined by a pair of transversely extending walls of the septum and the external surface e of the medial portion includes at least one portion that is substantially aligned with at least one of the transversely extending walls of the septum and the at least one rib is located adjacent to the at least one portion.
 10. The needleless luer access connector of claim 9 wherein the external surface of the medial portion includes two portions, each of which is substantially parallel to the pair of transversely extending walls of the septum.
 11. The needleless luer access connector of claim 10 including two ribs wherein one rib is located adjacent to one of the two portions of the external surface of the medial portion.
 12. The needleless luer access connector of claim 11 wherein the two ribs are about 180 degrees a part and are aligned with the pair of transversely extending walls of the septum and the two portions of the external surface of the medial portion.
 13. A needleless luer access connector, comprising: a housing having a top portion defining an inlet opening, a channel defined by at least one sidewall extending from the inlet opening and having a cross section, and a bottom portion defining an outlet opening extending from the channel, wherein the channel defines a slot extending into the sidewall about at least apportion of a circumference of the channel; a septum disposed in the housing, the septum having a proximal portion, a medial portion having an external surface and a cross section less than a cross section of the top portion and less than the cross section of the channel and a distal portion; a longitudinal slit extending through the septum from the proximal portion through medial portion and into the distal portion; and a key extending from the septum and into the slot
 14. The needleless luer access connector of claim 13 wherein the longitudinal slit is defined by a pair of transversely extending walls of the septum which are parallel to a transverse axis of the slit and wherein the slot is aligned with the transverse axis of the slit.
 15. The needleless luer access connector of claim 14 including two slots about 180 degrees apart and aligned with the transverse axis of the slit.
 16. The needleless luer access connector of claim 15 including two keys wherein one key is located in each of the two slots.
 17. The needleless luer access connector of claim 13 the key and the slot have complementary cross sections.
 18. The needleless luer access connector of claim 17 wherein the key extends from the proximal portion of the septum.
 19. The needleless luer access connector of claim 18 wherein the key and slot have complementary rectangular cross sections.
 20. The needleless luer access connector of claim 19 wherein the key and slot have complementary triangular cross sections.
 21. The needleless luer access connector of claim 20 wherein the key and slot have complementary polygonal cross sections.
 22. A needleless luer access connector, comprising: a housing have a top portion defining an inlet opening, a channel defined by at least one sidewall extending from the inlet opening and having a cross section, a nd a bottom portion defining an outlet opening extending from the channel, wherein the sidewall defines a key adjacent to the top portion of the housing; a septum disposed in the housing, the septum having a proximal portion, a medial portion having an external surface and a cross section less than a cross section of the top portion and less than the cross section of the channel and a distal portion; a longitudinal slit extending through the septum from the proximal portion through medial portion and into the distal portion; and a slot defined by the proximal portion engaged with the key.
 23. The needleless luer access connector of claim 22 wherein the longitudinal slit is defined by a pair of transversely extending walls of the septum which are parallel to a transverse axis of the slit and wherein the slot is aligned with the transverse axis of the slit.
 24. The needleless luer access connector of claim 23 including two slots about 180 degrees apart and aligned with the transverse axis of the slit.
 25. The needleless luer access connector of claim 24 including two keys wherein one key is located in each of the two slots.
 26. The needleless luer access connector of claim 23 the key and the slot have complementary cross sections.
 27. The needleless luer access connector of claim 26 wherein the key and slot have complementary rectangular cross sections.
 28. The needleless luer access connector of claim 27 wherein the key and slot have complementary triangular cross sections.
 29. The needleless luer access connector of claim 28 wherein the key and slot have complementary polygonal cross sections.
 30. A needleless luer access connector, comprising: a housing having a top portion defining an inlet opening, a channel defined by at least one sidewall extending from the inlet opening and having a cross section, and a bottom portion defining an outlet opening extending from the channel wherein at least a portion of the cross section defines a pair of shoulders about 180 degrees apart; a septum disposed in the housing, the septum having a proximal portion, a medial portion having an external surface and a cross section less than a cross section of the top portion and less than the cross section of the channel and a distal portion wherein the medial portion engages the shoulders; and a longitudinal slit extending through the septum from the proximal portion through the medial portion and into the distal portion.
 31. The needleless luer access connector of claim 30 wherein the longitudinal slit is defined by a pair of transversely extending walls of the septum which are parallel to a transverse axis of the slit and wherein the shoulders are substantially aligned with the transverse axis of the slit.
 32. A needleless luer access connector, comprising: a housing having a top portion defining an inlet opening, a channel defined by at least one sidewall extending from the inlet opening and having a cross section, and a bottom portion defining an outlet opening extending from the channel; a septum disposed in the housing, the septum having a proximal portion, a medial portion having an external surface and a cross section less than a cross section of the top portion and less than the cross section of the channel and a distal portion defining a substantially circular cross section in its unstressed condition; a longitudinal slit extending through the septum from the proximal portion through the medial portion and into the distal portion; and wherein the channel has a substantially elliptical cross section having a major axis and a minor axis along at least a distal portion thereof and the distal portion of the septum is located in and restrained by the distal portion of the channel such that the distal portion of the septum is biased into a substantially elliptical shape by the distal portion of the channel.
 33. The needleless luer access connector of claim 32 wherein the longitudinal slit is defined by a pair of transversely extending walls of the septum which are parallel to a transverse axis of the slit and wherein the transverse axis of the slit is substantially aligned with the major axis.
 34. The needleless luer access device of claim 33 wherein at least the portion of the slit adjacent to the bottom portion of the septum is open in the unstressed condition.
 35. A needleless luer access connector, comprising: a housing having a top portion defining an inlet opening, a channel defined by at least one sidewall extending from the inlet opening and having a cross section, a nd a bottom portion defining an outlet opening extending from the channel; a septum disposed in the housing, the septum having a proximal portion, a medial portion having an external surface and a cross section less than a cross section of the top portion and less than the cross section of the channel and a distal portion defining a substantially elliptical cross section with a major axis and a minor axis in its unstressed condition; a longitudinal slit extending through the septum from the proximal portion through the medical portion and into the distal portion; and wherein the channel has a substantially circular cross section along at least a distal portion thereof and the distal portion of the septum is located in and restrained by the distal portion of the channel such that the distal portion of the septum is biased into a substantially circular shape by the distal portion of the channel.
 36. The needleless luer access connector of claim 35 wherein the longitudinal slit is defined by a pair of transversely extending walls of the septum which are parallel to a transverse axis of the slit and wherein the transverse axis of the slit is substantially aligned with the minor axis.
 37. The needleless luer access device of claim 36 wherein at least the portion of the slit adjacent to the bottom portion of the septum is open in the unstressed condition.
 38. A needleless luer access connector, comprising: a housing having a top portion defining an inlet opening, a channel defined by at least one sidewall extending from the inlet opening and having a cross section, a nd a bottom portion having an upper surface; a septum disposed in the housing, the septum having a proximal portion, a medial portion having an external surface and a cross section less than a cross section of the proximal portion and less than the cross section of the channel and a distal portion, wherein the distal portion of the septum is displaced from the upper surface of the bottom portion of the housing to define an upper cavity, and wherein the housing further includes an outlet opening extending from the upper cavity such that the inlet opening and the outlet opening are in fluid flow communication; a longitudinal slit extending through the septum from the proximal portion through the medial portion and into the distal portion such that when a male luer taper is inserted into the slit, the distal portion is moved both laterally and distally into contact with the upper surface, substantially filling the upper cavity.
 39. A needleless luer access connector, comprising: a housing having a top portion defining an inlet opening, a channel defined by at least one sidewall extending from the inlet opening and having a cross section, a nd a bottom portion having an upper surface and an outlet opening extending from the channel such that the inlet opening and the outlet opening are in fluid flow communication; a septum disposed in the housing, the septum having a proximal portion, a medial portion having an external surface and a cross section less than a cross section of the proximal portion and less than the cross section of the channel and a distal portion having a peripheral surface constrained against movement by the housing; wherein an upper cavity is defined between the distal portion of the septum and the upper surface of the bottom portion of the housing; a longitudinal slit extending through the septum from the proximal portion through the medial portion and into the distal portion such that when a male luer taper is inserted into the slit but does not extend completely through the slit, an interior portion of the distal portion of the septum adjacent to the slit is moved distally so as to open the slit adjacent to the distal portion of the septum and substantially filling the upper cavity. 